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Tobacco leaves showing different brown spot symptoms. (A) Typical brown Download Scientific Diagram Types of cancer caused by tobacco Smoking and Cancer ASH Tobacco's harm doesn't stop at the lungs. When tobacco smoke or chewing products enter the body, cancer causing chemicals travel far beyond where they're inhaled or held. These carcinogens are absorbed into the Brown Spot of Tobacco NC State Extension Publications Tobacco leaves causing cancer, can also combat it: Study

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